package com.imy.luascript.retrofit;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;



import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.
 *
 * @author user
 */
@SuppressLint("SimpleDateFormat")
public class CrashHandler implements UncaughtExceptionHandler {
  public static final String TAG = "CrashHandler";

  private static final String SDCARD_ROOT = Environment
      .getExternalStorageDirectory().getAbsolutePath() + "/";

  private static String CRASH_SAVE_PATH = SDCARD_ROOT + "HYKB/Crash/";

  // CrashHandler 实例
  private static CrashHandler INSTANCE = new CrashHandler();

  // 程序的 Context 对象
  private Context mContext;

  // 系统默认的 UncaughtException 处理类
  private UncaughtExceptionHandler mDefaultHandler;

  // 用来存储设备信息和异常信息
  private Map<String, String> infos = new HashMap<String, String>();

  // 用于格式化日期,作为日志文件名的一部分
  private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

  /** 保证只有一个 CrashHandler 实例 */
  private CrashHandler() {
  }

  /** 获取 CrashHandler 实例 ,单例模式 */
  public static CrashHandler getInstance(String savePath) {
    if (savePath != null && !savePath.trim().equals("")) {
      CRASH_SAVE_PATH = savePath;
    }

    return INSTANCE;
  }

  /**
   * 初始化
   */
  public void init(Context context) {
    mContext = context;

    // 获取系统默认的 UncaughtException 处理器
    mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();

    // 设置该 CrashHandler 为程序的默认处理器
    Thread.setDefaultUncaughtExceptionHandler(this);
  }

  /**
   * 当 UncaughtException 发生时会转入该函数来处理
   */
  @Override
  public void uncaughtException(Thread thread, Throwable ex) {
    if (!handleException(ex) && mDefaultHandler != null) {
      // 如果用户没有处理则让系统默认的异常处理器来处理
      mDefaultHandler.uncaughtException(thread, ex);
    } else {
      try {
        Thread.sleep(3000);
      } catch (InterruptedException e) {
        Log.e(TAG, "error : ", e);
      }

      // 退出程序
      android.os.Process.killProcess(android.os.Process.myPid());
      System.exit(1);
    }
  }

  /**
   * 自定义错误处理，收集错误信息，发送错误报告等操作均在此完成
   *
   * @return true：如果处理了该异常信息；否则返回 false
   */
  private boolean handleException(Throwable ex) {
    if (ex == null) {
      return false;
    }

    // 使用 Toast 来显示异常信息
    new Thread() {
      @Override
      public void run() {
        Looper.prepare();
        //ToastUtils.show("很抱歉，程序出现异常，即将退出。");
        Looper.loop();
      }
    }.start();

    // 收集设备参数信息
    collectDeviceInfo(mContext);
    // 保存日志文件
    saveCrashInfo2File(ex);
    Log.e(TAG, "error : ", ex);
    return true;
  }

  /**
   * 收集设备参数信息
   */
  public void collectDeviceInfo(Context ctx) {
    try {
      PackageManager pm = ctx.getPackageManager();
      PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);

      if (pi != null) {
        String versionName = pi.versionName == null ? "null" : pi.versionName;
        String versionCode = pi.versionCode + "";
        infos.put("versionName", versionName);
        infos.put("versionCode", versionCode);
      }
    } catch (NameNotFoundException e) {
      Log.e(TAG, "an error occured when collect package info", e);
    }

    Field[] fields = Build.class.getDeclaredFields();
    for (Field field : fields) {
      try {
        field.setAccessible(true);
        infos.put(field.getName(), field.get(null).toString());
        Log.d(TAG, field.getName() + " : " + field.get(null));
      } catch (Exception e) {
        Log.e(TAG, "an error occured when collect crash info", e);
      }
    }
  }

  /**
   * 保存错误信息到文件中
   * *
   *
   * @return 返回文件名称, 便于将文件传送到服务器
   */
  private String saveCrashInfo2File(Throwable ex) {
    StringBuffer sb = new StringBuffer();
    for (Map.Entry<String, String> entry : infos.entrySet()) {
      String key = entry.getKey();
      String value = entry.getValue();
      sb.append(key + "=" + value + "\n");
    }

    Writer writer = new StringWriter();
    PrintWriter printWriter = new PrintWriter(writer);
    ex.printStackTrace(printWriter);
    Throwable cause = ex.getCause();
    while (cause != null) {
      cause.printStackTrace(printWriter);
      cause = cause.getCause();
    }
    printWriter.close();

    String result = writer.toString();
    sb.append(result);
    try {
      long timestamp = System.currentTimeMillis();
      String time = formatter.format(new Date());
      String fileName = "crash-" + time + "-" + timestamp + ".log";

      if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
        String path = CRASH_SAVE_PATH;
        File dir = new File(path);
        if (!dir.exists()) {
          dir.mkdirs();
        }
        FileOutputStream fos = new FileOutputStream(path + fileName);
        fos.write(sb.toString().getBytes());
        fos.close();
      }

      return fileName;
    } catch (Exception e) {
      Log.e(TAG, "an error occured while writing file...", e);
    }

    return null;
  }

  /**
   * 用于给遇到问题的用户打印日志
   */
  public static synchronized String saveErrorInfo2File(String msg) {
    try {
      DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
      long timestamp = System.currentTimeMillis();
      String time = dateFormat.format(new Date());
      String fileName = "crash-" + time + "-" + timestamp + ".log";

      if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
        String path = CRASH_SAVE_PATH;
        File dir = new File(path);
        if (!dir.exists()) {
          dir.mkdirs();
        }
        FileOutputStream fos = new FileOutputStream(path + fileName);
        fos.write(msg.getBytes());
        fos.close();
      }

      return fileName;
    } catch (Exception e) {
      Log.e(TAG, "an error occured while writing file...", e);
    }

    return null;
  }
}
